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-- This filter numbers second-level headings as chapters, and treats
-- first-level headings as "parts".

--- Fix numbering when using parts
--
-- This filter numbers second-level headings as chapters, and treats
-- first-level headings as "parts".
--
-- Copyright: © 2024 Albert Krewinkel <[email protected]>
-- License: MIT

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--- Lists the formats that support all the extensions given on the command line.
--
-- Usage:
--
--     pandoc lua list-formats.lua [extensions,...]
--
-- Example:
--
--     $ pandoc lua list-formats.lua native_numbering citations
--     docx

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local function sentence_lines (el)
  local inlines = el.content
  for i = 2, #inlines do
    if inlines[i].t == 'Space' and
       inlines[i-1].t == 'Str' and
       inlines[i-1].text:match '%.$' then
      inlines[i] = pandoc.SoftBreak()
    end
  end
  return el

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--[[
Add support for a custom inline syntax.

This pandoc Lua filter allows to add a custom markup syntax
extension. It is designed to be adjustable; it should not be
necessary to modify the code below the separator line.

The example here allows to add highlighted text by enclosing the
text with `==` on each side. Pandoc supports this for HTML output
out of the box. Other outputs will need additional filters.

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function interactive (it, env)
  local has_readline, RL = pcall(require, 'readline')

  if not has_readline then
    RL = {
      readline = function (prompt)
        io.stdout:write(prompt)
        return io.read()
      end
    }

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-- Generate a Table of Contents.
--
-- This is an adaption of the Haskell code used in pandoc. This script
-- is intended to be adapted to specific requirements before use. E.g.,
-- it can be modified to add additional elements as TOC items, to add
-- more info to each line in the TOC, or to control whether the heading
-- number is included in the link.

local PANDOC_WRITER_OPTIONS = PANDOC_WRITER_OPTIONS
_ENV = pandoc

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-- This is a sample custom writer for pandoc, using Layout to
-- produce nicely wrapped output.

local layout = pandoc.layout
local text = pandoc.text
local type = pandoc.utils.type

local l = layout.literal

-- Table to store footnotes, so they can be included at the end.

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local known_exts = pandoc.List{".png", ".jpg", "jpeg"}
if FORMAT:match 'tex' then
  known_exts = pandoc.List {
    ".pdf", ".png", ".jpg", ".mps", ".jpeg", ".jbig2", ".jb2"
  }
elseif FORMAT:match 'html' then
  known_exts = pandoc.List {
    ".svg", ".png", ".jpg", ".jpeg", ".webp", ".gif"
  }
end

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-- Render TeX and LaTeX like the `\TeX` and `\LaTeX{}` macros do.
-- Copyright © 2020 Albert Krewinkel <[email protected]>
-- License: MIT License

-- Style inspired by https://tess.oconnor.cx/2007/08/tex-poshlet
local style = pandoc.RawBlock('html', [[
<style>
.tex-logo sub, .latex-logo sub {
  font-size: 100%;
  margin-left: -0.1667em;

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local List = require 'pandoc.List'

local meta

function merge_meta(m1, m2)
  local result = m1
  for k, v in pairs(m2) do
    if result[k] == nil then
      result[k] = v
    end